What is the best drain cleaner/uncloger?
As opposed as I am to adding more Toxins to our already messed up eco system I have a suggestion. If your plumbing is at all accessible; somewhere in the drain line 2″ or 4″ there should be cleanout plugs. Usually just a threaded cap/insert at a junction allowing removal even with a crescent wrench. From there a snake both ways to determine the cause of what might be causing the tub back up. With all due respect to any here; I want to believe there is some awareness that NOT everything touted as a “Miracle” is in fact a miracle. Advertising sells products to the brain; not always capable of doing what is stated.
